Electrical switch.



M. G. BUNNELL. ELECTRICAL SWITCH.

APPLICATIDN FILED SEPT.6. 1912.

Patented Nov. 7,1916:

'ilifil fiitlfll' {in BUNllEEL, Q33 CE-HGAGO, ILLINOIS, ASSIGNOR TO NEW ERA MFG. 00., OF CHICAGO, ILLINGIS.

ELECTRICAL SWITCH.

Specification of Letters itatent.

, T all whom it may concern Eli Be it known that l, MORTON G. BUNNELL, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Electrical Switches, of

which the following is av specification.

My invention relates to, electrical switches of thatlrind in which means are provided for holding the switch in either open or closed position, and in which a. push button, or other similar means, is provided for operating the switch, together, with a spring applied in such manner that only a slight movement is required to cause the said push button, or the like, to move from one position to the other, practically just enough to start in either direction, the said spring then serving to complete the operation, as well as to hold the push button or the like in either posit-ion.

Generally stated, the object of my invention is to provide a novel and improved and highly etiicient electrical switch of the foregoing general character.

Special objects of my invention are to simplify the construction of a switch of this kind; to provide a switch of this kind which will operate positively and with certainty;

to rovide aswitch of this kind which will i not be liable to break or wear out as rapidly as heretofore; and to provide certain details and novel features of construction tending to increase the general efficiency and serviceability of an electrical switch of this particular character.

To theforegoing and other useful ends, my invention consists /in matters hereinafter set forth and claimed.

In the accompanying drawings: Figure l is a side elevation of an electrical switch embodying the principles of my invention, showing the same in closed position. Fi 2 is a similar view showing the said switch in open position. Fig. 3 is a transverse section on line 33- inFig i. Fig. 4- is a. transverse section on line l'l in Fig. 2. Fig. 5 is a front elevation of the switch shown in Figs. 1 and :2.

As thus illustrated, my invention comprises a rectangular metal frame A provided internally *ith a portion a which provides tangular in cross section and provided at its Patented Nov. '7, 1916.,

a li ation filed September 6, 1912. Serial No. 718,849.

may be shifted endwise in the said frame.

The said push button has an external central portion 1) which provides a pair of shoulders, and a spring 6 is inclosed within the said hollow body portion of the push button. ll e said spring, it will be seen, has a pro- Jectmg portion which is bentto provide inclines with a ridge between them, similar in effect to the portion a of the frame. The said spring projects from the side of the push button which; is opposite the portion a 0 the frame, and consequently the said spring 18 compressed by-the portion a when the push button is moved in either direction. When the push button is moved in one direction, the said spring is compressed and tends to resist such movement until its point 0r outer end passes the ridge or center of the portion a, and then the tension of the spring is asserted in a manner to cause it to complete the movement of the push button.

The U-shaped sheet metal member C is provided in each end portion thereof with a rectangular opening for the body of the push button, and the distance between these two end portions is, it will be seen, somewhat greater than the length of the portion 6 which is secured to the push button. With this arrangement, the member C does not move immediately upon the actuation of the push button, but only moves when one of the shoulders of the )ortion 7) engages one of the end portions of said member, whereby there is lost motion between said member and push-button. The said member 0 carries' an electrical contact member D, which face of the frame A as by rivets c, and are insulated from the said frame by the sheet of insulation 8 which latter is of any suit--' able material. The members E are provided ,with right angle terminal portions 6 provided with screws 6 for connecting the circuit wires. The upper ends of the members E extend outward, and are provided with downwardly bent portions 6 which latter provide rests in which the portionsd enter and feed tightly when the switch is closed, it being observed that at such time the two members E are electrically united, whereby the circuit is closed.

'- which control the circuit.

that the said contacts do not begin to se'pa:

In Fig. 1 the switch is shown closed, the

push button having been shifted upwardly for this purpose. To open the switch, the said button 1s compressed downwardly, and as soon as the ridge or point of the spring b passes the center ofthe portion a, the push button then jumps forward under the tension of the spring and opens the contacts It will be seen rate until the lower shoulder of the portion 5 strikes the member .Gythe push button being capable of moving for some distance before the said member begins to move. In

I this way the spring 1) serves to' hold the switch inv either open or closed position. When the push button is moved in one direction, the switch is opened, and when it is ,moved in the opposite direction the switch is closed, and in each case the spring not only serves to complete the movement of the push button, but serves also to hold the latter in its shifted position. I neither case, does the initial movement of the push button disturb the condition of the 'electrical circuit controlling contacts.

I do not limit myself to the exact construction shown and described.

What I claim as my invention is:

1. A jump-switch pomprising. a metal frame (A), a push-button-(B) having ends I (b) and a middle portion (6 a- U-shaped slide (G). onsaid push-button, a contactstrip (D) carried by and insulated from said slide, a pair of contacts (E) secured to and insulated fromone side of said frame, to

Also, and in strip (D) carriedby and insulated from said slide, a pair of contacts (E secured to and insulate from one side 0 said frame, to engage said contact-strip, a cam (a) on the other side ofsaid frame, and a spring 6 I in saidpush-button to engag'saideam and 'thereby operate the switch with a jumpmotion in either directiod, said middle por tion (5 being shorter than said slide ((3)- and located between the ends thereof to pro vide lost motion between said push-button and said contactstrip.

3. A 'ump-switch comprising, a' metal 65 frame a push-button (B) having ends (b) and a middle portion (b ),'-a U-shaped slide (C)'on said push-button, a contact strip (D) [carried by and insulated from said slide, a pair of contacts (E) secured toand insulated from one side of said frame,

to engage said contact-strip, a cam (a) on the other side of said frame, an'da s ring (6 in said push-button to engage sai camand thereby operate the switch with a j umpf motion in either direction said spring (6) projecting from said mi die portion, and said slide (C) engaging the ends of Said frame to limit the motion of said ton and said contact-strip. 1

Signed by meat Chicago, Illinois,"this 30 day of August 1912.

' MORTONG BUNNELL. Witnemes:

H. D. KNUnsoN,'-

L. GLADSTONE.

push-butenga'ge said contact-strip, a cam (a) on the 

